Building a Vector Monitor Controller

crt [fredkono] has a few vintage Atari arcade boards sitting around, and without the rest of the arcade machine – especially the XY CRT – these boards would continue to gather dust. The solution to this terrible shortage of vintage video games was to build a vector monitor from scratch. No, that doesn’t mean building a new CRT, but it does mean rewiring the yoke and building a CRT controller board for tubes salvaged from small, old TVs.

Nearly all the CRTs you’ll find at your local goodwill or surplus shop are raster displays. The CRTs used in the old Atari games were vector displays and extremely similar to the tubes found in old oscilloscopes. [fred] turned the CRT found in an old 9″ color TV into a vector monitor by rewinding the yoke.

With the tube rewired, it was only a matter of connecting the custom deflection circuit boards and getting the old arcade boards running. The images drawn with the new yoke deflector board are great and produce fine, crisp lines of some of the most famous video games in history.

3D Printer Gets Wheels, Leaves Trail Of Plastic Boxes

3&DBot Robot 3D Printer

The limitation of 3D Printer build volume is over. The folks over at NEXT and LIFE Labs have created a prototype robot with a 3D print head attached to it. Unlike a traditional 3D Printer that moves the print head around within the confines of a machine, the 3&DBot drives the print head around any flat surface, extruding as it goes.

Although the 3&DBot has 4 wheels, they are all stationary and face independent directions. Normally, this arrangement would only allow a vehicle to rotate in a circle. However, the wheels used here are not conventional, they are Mecanum-style with many mini-wheels around the main. This arrangement allows omnidirectional movement of the robot, depending on how each wheel is driven. If you haven’t seen this type of movement before, it is definitely worth watching the video after the break.

Sure, the print quality leaves something to be desired and the distance the print head is from the robot chassis may be a bit limiting but all new technology has to start somewhere. This is a great joining of two technologies. Don’t scoff, remember your Iphone 12 wouldn’t be possible without this.

[Read more...]

Fail of the Week: Robotic 1950 Mercury Boogies, Won’t Come Back From Dead Man’s Curve

1950 Mercury[Dave] wanted to make an Arduino robot out of a remote-control 1950 Mercury. He removed the RC portion from the car and kept the drive and steering motors. The idea was to use three ultrasonic rangefinders in the grille real estate and move the car forward based on the longest distance detected.

He initially used a Seeed motor controller and some Grove cables soldered to his sensors to power the steering. It went forward, but only forward, and [Dave] decided the motor controller and the car’s steering motor weren’t playing well together.

[Dave] had the idea to use relays instead to both power the motor and determine polarity. Now, the Merc was turning and avoid obstacles about half the time, but it was also getting dinged up from hitting walls. He figured out that his sensor arrangement was making the car turn immediately and decided to give the program information from the wheels with a reed switch and a rare earth magnet. The only problem is that the caliber of magnet required to trip the reed switch is too heavy and strong. [Dave] and has concluded that he simply can’t exercise the kind of control over the car that he needs. and will build his own robot chassis.


2013-09-05-Hackaday-Fail-tips-tileFail of the Week is a Hackaday column which runs every Wednesday. Help keep the fun rolling by writing about your past failures and sending us a link to the story — or sending in links to fail write ups you find in your Internet travels.

A DIY MIDI Wind Controller

wind MIDI is more than just keyboards and a matrix of buttons that plays samples; there are MIDI controllers for virtually every instrument that has ever existed, from guitars to harps and even woodwinds. [J.M.] didn’t like the features found in existing wind MIDI controllers, so he’s building his own with features that put it far beyond any commercial offering.

Woodwind MIDI controllers are relatively simple; put a pressure sensor in the mouthpiece and turn that data into note on and note off commands. A few buttons, or in [J.M.]‘s case, resistive touch sensors, are easily mapped to different fingerings and notes for the instrument. An Arduino Nano takes care of all this hardware, and a 2.4 GHz radio module to communicate wirelessly to a base station.

Once at the base station, the MIDI data can be output to any number of synths and computers, but [J.M.] added a MIDI codec chip right in the device to play with only a set of headphones. It doesn’t sound great – about the same as an old Sound Blaster card – but with the mod and expression control a wind controller offers, it’s more than passable as a real woodwind.

Videos below.

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THP Hacker Bio: IamTeknik

iamteknik

[IamTeknik]‘s reason for entering his home automation assistant into The Hackaday Prize is simple; we have smart phones, TVs, and even smart cars. Why not a smart house?

Like its namesake from Iron Man, Project Jarvis is an intelligent assistant with a bit of home automation thrown into the mix. The hardware includes the usual relays and door locks, but that’s just the start of it. There’s also a personal digital assistant, living somewhere in the space between the hardware modules and [IamTeknik]‘s smartphone. Here, voice recognition, speech synthesis, and a Siri-like functionality is the name of the game. Jarvis is capable of answering questions, compiling reports, reading social network messages, and automating everything connected to the main base station over the Internet.

[IamTeknic] has been busy studying computer systems engineering and of course working on his project for The Hackaday Prize lately, but he was able to sit down and answer a few questions for our THP hacker bio. You can check that out below, along with a few demos of what his personal Jarvis can do.

[Read more...]

Using a Theremin for Medical Applications

theremin

[Eswar] is not an ordinary 16 years old boy. He figured out a noninvasive way to measure breathing in hospitals for less than $50. He is using a theremin to measure the rise and fall of a patient’s chest. For our curious readers, this touch-less instrument was invented back in 1929 by the Russian inventor [Leon Theremin]. It uses the heterodyne principle and two oscillators to generate an audio signal. One electronic oscillator creates an inaudible high pitch tone while another variable oscillator is changed by adding capacitance to an antenna.

As you can guess the space between the patient’s chest and the antennas placed around the bed forms a tiny capacitor which varies when exhaling. With three simple TTL chips and a little guessing [Eswar] had a working prototype ready to be implemented in the real world. If you’re interested in theremin, we invite you to see one of our previous articles on how to make one in a few minutes with a soda can.

A Proof of Concept Project for the ESP8266

weather

It’s hardly been a month since we first heard of the impossibly cheap WiFi adapter for micros, the ESP8266. Since then orders have slowly been flowing out of ports in China and onto the workbenches of tinkerers around the world. Finally, we have a working project using this module. It might only be a display to show the current weather conditions, but it’s a start, and only a hint of what this module can do.

Since the ESP8266 found its way into the storefronts of the usual distributors, a lot of effort has gone into translating the datasheets both on hackaday.io and the nurdspace wiki. The module does respond to simple AT commands, and with the right bit of code it’s possible to pull a few bits of data off of the Internet.

The code requests data from openweathermap.org and displays the current temperature, pressure, and humidity on a small TFT display. The entire thing is powered by just an Arduino, so for anyone wanting a cheap way to put an Arduino project on the Internet, there ‘ya go.

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